Method of taper-finishing metallic bodies.



W. W. DOOLITTLE.

METHOD OF TAPER FINISHING METALLIC BODIES.

APPLICATION FILED APR. 24. 19!

Patented Jan. 23,1917.

2 SHEETSSHEET I.

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WILLIAM W. DOOLITTLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO CRANE COMPANY,OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

METHOD OF PAPER-FINISHING METALLIC BODIES.

Specification of Letters Patent.

Patented J an. 23, 1917.

Application filed April 24, 1916. Serial No. 93,132.

' Taper-Finishing Metallic Bodies, of which the following is a fulldescription, such as,

will enable others skilled in the art to practise and use the same.

My invention relates generally to the art of manufacturing metallic castbodies, and has reference more particularly to an improved method oftaper finishing the initial diametered cylindrical portions of suchbodies to the required finish diameter.

In practice I have employed my method with great advantage in taperfinishing the taper hole portion of a cock body and the taperedcylindrical external portion of its corresponding cock. Heretofore ithas been customary to taper finish such portions by the employmentsolely of one or more taper reamers, and in cutting through the hardscale of the casting to the desired finish diameter considerableexpenditure of power 7 was required to operate the reamers, during whichoperation this expensive class of tool was subjected to an excessivedegree of wear and tear, as is well known.

My invention has for its objects to effect a material reduction in thisexpenditure of power and in this excessive wear and tear upon tools andtheir operating parts, and in this connection contemplates theemployment of a cheaper class of tool and in a novel manner designed tofacilitate the cutting through of the scale of the casting.

- The method in which my invention resides consists in subjecting thetapered cylindrical portion of the casting to the progressive cuttingaction of a series of relatively cheaper drills of gradually diminishingor increasing diameters as the case may be, the drills presentingstraight cutting faces in eschelon to the work so as to permit verticaland independent cuts to be taken therein along different horizontalplanes, and then grinding down to the required finish diameter theprojecting steps of uncut stock or burs left in the cuts, by theintroduction of a suitable tool, as a taper reamer.

The accompanying drawings forming a part of this specificationillustrate in a conventional manner the tools and work support desirablyused in the carrying out of my novel method, and in my co-pendingapplication of even date herewith, Serial Number 93,133, I havedisclosed and illustrated a preferred form of machine embodying saidtools and work support and their operating mechanism.

In these drawings, Figure 1 represents the tools and work supportinvolved in carrying out my novel method; Figure 2 is a perspective viewof a cock body and its cock; and Figures 3 and a: represent views insection of the cock body and cock, respectively, illustrating theprogressive cuts taken by the straight drills.

Referring to the drawings, it will be seen that I provide a series ofstraight drills A to A inclusive, carried in any suitable manner, as ina drill frame, (not shown), having their cutting faces projecting towardthe work support B in gradually lowering and diii'ering terminal.planes. The drills are of gradually diminishing diameters, and in thepresent instance the first drill A has the greatest diameter and thelast drill A the least, the drills reducing in diametrical proportion asthey more nearly approach the plane of work support. The drills and thetable are relatively movable in a vertical plane, but preferably thetable has this movement in order to bring the work in operative relationwith the drills. C indicates a taper reamer to which reference will bebe made hereinafter; and D the cock body and E the cock, whose inner andouter tapered cylindrical portions, respectively, are subjected to thecutting action of the drills and reamer.

The work, in this instance the cock body I), is fixed in position on thetable B immediately under the first drill A and being raised by thetable theretoward, the first cut a (Figure 3) through the scale is madealong a vertical line 79 that extends diagonally of the dotted line mand the full line 91,, the former representing the initial or castdiameter and the latter the desired finish diameter of the cock body.This cut leaves a projecting step g of uncut stock. The

drill A the table thereupon being again raised and a second out a in adifierent and lower plane is taken by drill A at the same time the firstcut is made in the body under the drill A Progressive cuts are thussuccessively taken in difiering horizontal planes until the last cut ahas been made, leaving a series of superposed steps Q whose projectingfaces are in diii'ering vertical planes which are readily ground oil bythe reamer C to the finish diameter since the hard scale has at readybeen cut through by the drills. In carrying out this method inconnection with an external taper face such as that presented by thecock E, hollow or shell drills and reamers need only be substituted, thefirst drill then in this instance having the least diameter and the lastdrill the greatest, the cuts a to a being taken, and the finish reamingof the steps 9 completed, exactly as has already been described in thecase of the cocl: body D.

It will thus be seen that progressive cuts are taken in successivesurface portions of the taper face of the casting along linesindependent of each other and diagonal to'the :5 planes of the initialand finish diameters m and n, thus facilitating the sectional cuttingthrough of the scale and the subsequent readv reaming of the steps downto the desired finish diameter.

Having thus described my invention and illustrated its use, what I claimas new and desire to secure by Letters Patent, is the following Theherein described method of working the initial diametered tapercylindrical face of a cast body or the like to its finish taperdiameter, which consists in subjecting the face to the progressivecutting action of a series of tools successively cutting into the stockat different depths in said face along lines diagonal to the planes ofthe initial and finish diameters, thereby leaving steps of uncut stockon said face, removing the body from one tool to another as a cut istaken, and dressing down the uncut stock on said face to the desiredfinish taper diameter.

In testimony whereof I have hereunto signed my name.

lVILLIAM XV. DOOLITTLE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

